big deal

柯林斯詞典

1. N-SING If you say that something is a big deal, you mean that it is important or significant in some way. 至關重要的事情[非正式]
I felt the pressure on me, winning was such a big deal for the whole family. 我感到了身上的壓力，取勝對全家人是這麼至關重要的事。
2. PHRASE If someone makes a big deal out of something, they make a fuss about it or treat it as if it were very important. 小題大做[非正式]
The Joneses make a big deal out of being "different."
瓊斯一家子把“與衆(zhòng)不同”看作是了不得的事。
3. CONVENTION You can say "big deal" to someone to show that you are not impressed by something that they consider important or impressive. 沒什麼大不了[非正式]
"You'll miss The Brady Bunch."—"Big deal."
“你會錯過《佈雷迪家庭》的。” — “沒什麼大不了的。”